Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element – Having plastically flowable or deflectable end – e.g. – rivet,...
Patent
1985-12-02
1988-06-07
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element
Having plastically flowable or deflectable end, e.g., rivet,...
29522A, 29526H, F16B 1906
Patent
active
047493232
ABSTRACT:
The invention is a tapered tail rivet for joining two or more structural elements together which, during driving, provides a controlled expansion of the hole and, after driving, leaves residul hoop compression stresses around the hole. The tapered tail rivet has a shank having a nominal diameter (the diameter in the middle of the tolerance range). The head diameter may be of the type critically dimensioned based on the shank diameter or other design parameter. The tapered tail length is between 1.30 times the minimum shank diameter and 1.10 times the maximum shank diameter. The distal end of the tapered tail has a diameter of between 0.80 times the minimum shank diameter and 0.68 times the maximum shank diameter. The tapered tail portion should extend to the face of one of the structural elements to just inside the face of that structural element prior to driving. The minimum upset tail diameter should be 1.45 times the nominal shank diameter and the minimum upset tail height should be 0.30 times the nominal shank diameter.
REFERENCES:
patent: 1457008 (1919-10-01), Smith
patent: 1480485 (1923-02-01), Yonce
patent: 1966401 (1931-05-01), Andren
patent: 2237338 (1941-04-01), Dale
patent: 3516699 (1969-02-01), Bergere
patent: 3561102 (1971-02-01), Diemer
patent: 3680429 (1970-03-01), Briles
patent: 4004484 (1977-01-01), Speakman
patent: 4051592 (1977-10-01), Briles
Bakow Leon
Incardona Angelo
Kikendall Garth D.
Richardson David G.
Sparling Kenneth P.
Dachs Louis L.
Gall Lloyd A.
Lockheed Corporation
Smith Gary L.
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